/*******************************************************************************
 * This file is part of blueprint4j www.blueprint4j.org.
 * 
 *     blueprint4j is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     blueprint4j is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 * 
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with blueprint4j. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package blueprint4j.db;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.sql.*;

import blueprint4j.utils.*;

abstract public class FieldIntegerCalculated extends FieldInteger implements BindIntegerInterface {

	/**
	 * public Field( String p_name, String p_description, boolean p_key_field
	 *
	 * Name: Name of field -> equivalent to table.field_name
	 * Description: Description of field
	 * key_field: Is this field a key field in the table (index field)
	 */
	public FieldIntegerCalculated( String p_name, int p_field_type ,String p_description,Entity entity ) {
		super( p_name,p_field_type|Field.FIELD_READ_ONLY,p_description,entity );
	}

	public Integer get()  {
		return (Integer)calculateNow();
	}

	public void set(Integer value) {
		setObject(calculateNow());
	}

	private Integer calculateNow(){
		Integer value=calculate();
		if (value!=getObject() && (value==null || !value.equals(getObject()))){
			setChanged(true);
			Log.trace.out("Field ++++","Changed "+value+" from "+getObject()+" true");
			return value;
		}
		Log.trace.out("Field ++++","Changed "+value+" from "+getObject()+" false");
		return (Integer)getObject();
	}

	abstract protected Integer calculate();
}
